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download original drivers from manufacturer, that's compaq. if the sound card is available in control panel in system/sound then it is not installed. just install fresh drivers or the ones you got with laptop
hello. sir. i have lost sound from my lap top Compaq presario C700 after installing windows XP. kindly help me. my laptop is also showing pproblem during installation of hard drive for same driver, every time i turn on my laptop. i donot have the installation mother board for the same laptop